Java窗体小demo

电玩女神 2022-05-15 10:15 156阅读 0赞

# 1，空白窗体demo #

public static void main(String[] args) throws Exception {
    
    		test();
    	}
    
    	public static void test() throws Exception {
    
    		JFrame frame = new JFrame("守护进程"); // 创建指定标题的JFrame窗口对象
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 关闭按钮的动作为退出窗口
    		frame.setSize(800, 600); // 设置窗口大小
    		Dimension displaySize = Toolkit.getDefaultToolkit().getScreenSize(); // 获得显示器大小对象
    		Dimension frameSize = frame.getSize(); // 获得窗口大小对象
    		if (frameSize.width > displaySize.width)
    			frameSize.width = displaySize.width; // 窗口的宽度不能大于显示器的宽度
    		if (frameSize.height > displaySize.height)
    			frameSize.height = displaySize.height; // 窗口的高度不能大于显示器的高度
    		frame.setLocation((displaySize.width - frameSize.width) / 2, (displaySize.height - frameSize.height) / 2); // 设置窗口居中显示器显示
    		frame.setVisible(true); // 设置窗口为可见的，默认为不可见
    
    		// 窗体图标设置 注意路径问题 
    		String src = "/first/Chrysanthemum.jpg";
    		Image image = ImageIO.read(frame.getClass().getResource(src));
    		frame.setIconImage(image);
    
    		JPanel panel = new JPanel();
    		JTextArea textArea = new JTextArea();
    
    		panel.setLayout(new GridLayout());
    		textArea.setText("test \n");
    		// 当TextArea里的内容过长时生成滚动条
    		panel.add(new JScrollPane(textArea));
    		frame.add(panel);
            //循环添加文本
    		int k = 0;
    		while (true) {
    			Thread.sleep(1000);
    			textArea.append("text=====" + k++ + "     ");
    			if (k % 10 == 0) {
    				textArea.append(" \n");
    			}
    		}
    
    	}

# 2，含有组件的窗体 #

package Frame;
    
    import java.awt.Container;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.FocusEvent;
    import java.awt.event.FocusListener;
    
    import javax.swing.*;
    import javax.swing.WindowConstants;
    
    public class EndInt extends JFrame {
        public EndInt() {
            super();
            this.setTitle("注册");
            //创建容器
            Container cont = getContentPane();
            //设置为自由布局
            this.setLayout(null);
            //各组件的创建
            JLabel jl1 = new JLabel("请输入昵称：");                    //标签框
            JTextField jtf1 = new JTextField();                        //文本框
            JLabel jl2 = new JLabel("请输入登录密码：");
            JPasswordField jpf1 = new JPasswordField();                //密码框
            jpf1.setEchoChar('*');                                    //设置密码字符为*
            JLabel jl3 = new JLabel("再次输入登录密码：");
            JPasswordField jpf2 = new JPasswordField();
            jpf2.setEchoChar('*');    
            JLabel jl4 = new JLabel("请选择性别：");                    //单选框
            JRadioButton jrb1 = new JRadioButton("男");
            JRadioButton jrb2 = new JRadioButton("女");
            ButtonGroup bg = new ButtonGroup();                        //一定将单选框加入进去，不然男女能同时选择
            bg.add(jrb1);
            bg.add(jrb2);
            jrb1.setSelected(true);                                    //设置默认为男
            JLabel jl5 = new JLabel("请选择城市：");                    //下拉框
            JComboBox jcb = new JComboBox();
            jcb.addItem("北京");
            jcb.addItem("天津");
            jcb.addItem("武汉");
            jcb.setSelectedIndex(0);
            JLabel jl6 = new JLabel("个性签名：");
            JTextArea  jta2 = new JTextArea();
            jta2.setLineWrap(true);                                    //设置文本框为自动换行
            JScrollPane jsp = new JScrollPane(jta2);                //设置文本框有滚动条
            JButton jb1 = new JButton("申请账号");                    //按钮
            JButton jb2 = new JButton("重置信息");
            //申请账号
            jb1.addActionListener(new ActionListener() {
                
                @Override
                public void actionPerformed(ActionEvent e) {
                    // TODO Auto-generated method stub
                    //判断两次密码是否一致，一致时弹出成功，不一致时提示不一致并情况两次填写的密码框
                    String str1 = new String(jpf1.getPassword());    //先将密码转换为String类型，然后再比较
                    String str2 = new String(jpf2.getPassword());
                    if(str1.equals(str2)){
                        JOptionPane.showMessageDialog(null, "申请成功！您的账号是："+12323+"；密码是："+jpf1.getText());
                    }
                    else
                    {
                        JOptionPane.showMessageDialog(null,"两次输入的密码不一致，请重新输入！");
                        jpf1.setText("");
                        jpf2.setText("");
                    }
                    //JOptionPane.showMessageDialog(null, "申请成功！您的账号是："+12323+"；密码是："+jpf1.getText());
                }
            });
            //重置信息
            jb2.addActionListener(new ActionListener() {
                
                @Override
                public void actionPerformed(ActionEvent e) {
                    // TODO Auto-generated method stub
                    //清空
                    jtf1.setText("");
                    jpf1.setText("");
                    jpf2.setText("");
                    jrb1.setSelected(true);
                    jcb.setSelectedIndex(0);
                    jta2.setText("");
                }
            });
            //将空间加入到Container容器里面
            cont.add(jl1);
            cont.add(jtf1);
            cont.add(jl2);
            cont.add(jpf1);
            cont.add(jl3);
            cont.add(jpf2);
            cont.add(jl4);
            cont.add(jrb1);
            cont.add(jrb2);
            cont.add(jl5);
            cont.add(jcb);
            cont.add(jl6);
            cont.add(jsp);
            cont.add(jb1);
            cont.add(jb2);
            //控制各组件的位置及大小
            jl1.setBounds(30, 20, 120, 20);
            jtf1.setBounds(150, 20, 200, 20);
            jl2.setBounds(30, 50, 120, 20);
            jpf1.setBounds(150, 50, 200, 20);
            jl3.setBounds(30, 80, 120, 20);
            jpf2.setBounds(150, 80, 200, 20);
            jl4.setBounds(30, 110, 120, 20);
            jrb1.setBounds(190, 110, 50, 20);
            jrb2.setBounds(260, 110, 50, 20);
            jl5.setBounds(30, 140, 120, 20);
            jcb.setBounds(150, 140, 200, 20);
            jl6.setBounds(30, 170, 120, 20);
            jsp.setBounds(150, 170, 200, 80);
            jb1.setBounds(80, 280, 100, 20);
            jb2.setBounds(200, 280, 100, 20);
            //设置窗体大小、位置、关闭方式、不允许拉伸及显示
            this.setBounds(500, 260, 400, 350);
            this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
            this.setResizable(false);
            this.setVisible(true);
        }
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            //调用构造方法
            new EndInt();
        }
    
    }